A DA50 on takeoff climb at 500 ft the main landing gear would not retract. Had gear and door warning light. Found jack pad on left main gear from brake replacement.

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Attributes
ACN	696308
Time
Date	200605
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sjc.airport
State Reference	CA
Altitude	msl single value : 500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	general aviation : corporate
Make Model Name	Falcon 50
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 130 flight time total : 11000 flight time type : 500
ASRS Report	696308
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 120 flight time total : 8500 flight time type : 280
ASRS Report	696193
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure
Independent Detector	aircraft equipment other aircraft equipment : lndg gear warning other flight crewa other flight crewb
Resolutory Action	other
Consequence	other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : inspection performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Flight Crew Human Performance Maintenance Human Performance Aircraft Chart Or Publication
Primary Problem	Maintenance Human Performance

Narrative:

Prior to acceptance of aircraft; maintenance replaced a brake on the left main gear. During the preflight; the first officer missed a metal piece used by maintenance that was attached to the left main strut. I looked at the gear prior to leaving the ramp from the front of the aircraft and did not notice the metal piece (the piece of metal was painted a baby blue and this blended well with the gray of the strut. After getting airborne the main gear would not retract properly (the piece of metal was attached on the uplock). Cycled the gear once; still could not get a positive gear retraction. We then extended the landing gear and leveled off at 2000 ft to return for a normal visual approach and landing. The piece of metal fell after clearing the runway but prior to reaching our hangar. The piece of metal is now painted a bright red and has a flag attached to it.

Original NASA ASRS Text

Title: A DA50 ON TKOF CLB AT 500 FT THE MAIN LNDG GEAR WOULD NOT RETRACT. HAD GEAR AND DOOR WARNING LIGHT. FOUND JACK PAD ON L MAIN GEAR FROM BRAKE REPLACEMENT.

Narrative: PRIOR TO ACCEPTANCE OF ACFT; MAINT REPLACED A BRAKE ON THE L MAIN GEAR. DURING THE PREFLT; THE FO MISSED A METAL PIECE USED BY MAINT THAT WAS ATTACHED TO THE L MAIN STRUT. I LOOKED AT THE GEAR PRIOR TO LEAVING THE RAMP FROM THE FRONT OF THE ACFT AND DID NOT NOTICE THE METAL PIECE (THE PIECE OF METAL WAS PAINTED A BABY BLUE AND THIS BLENDED WELL WITH THE GRAY OF THE STRUT. AFTER GETTING AIRBORNE THE MAIN GEAR WOULD NOT RETRACT PROPERLY (THE PIECE OF METAL WAS ATTACHED ON THE UPLOCK). CYCLED THE GEAR ONCE; STILL COULD NOT GET A POSITIVE GEAR RETRACTION. WE THEN EXTENDED THE LNDG GEAR AND LEVELED OFF AT 2000 FT TO RETURN FOR A NORMAL VISUAL APCH AND LNDG. THE PIECE OF METAL FELL AFTER CLRING THE RWY BUT PRIOR TO REACHING OUR HANGAR. THE PIECE OF METAL IS NOW PAINTED A BRIGHT RED AND HAS A FLAG ATTACHED TO IT.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.